Doesn't this have...uhm... nothing to do with metaphysics? Or philosophy at all?

I think,you should look at the symbol and then go and look up the meaning of metaphysics;)

Metaphysics - from the Greek META (After) PHUSIKA (The Works/Physics), from the title of Aristotle's treatise on first principles, so called because it followed his treatise on physics. In philosophy, it is used to refer to the discussion of first principles, it is essentially a rational inquiry into the nature and function of the world.

I looked at the symbol - it illustrated nothing about the fundamental principles underlying the function of the world, gave no insights into human knowledge. The site to which you linked consisted of several images of the flower of life and various masonic, Judaic, and Satanic symbols which it purported were derived from the aforementioned tesselation.

Forgive and enlighten me if I fail to see the connection between the "Flower of Life" and philosophical metaphysics.

The symbol brings to mind a yandra, used in Vedic belief structure, among countless others, as a symbolic representation of the divine. In the days before sassy nihilist philosophers it actually represented the presence of the divine. It is related to Islamic geometry, the Rose windows of Europe's great cathedrals, Keplers "celestial physics", and of course, the eternal sacred geometer of the first man to call himself a philosopher, Pythagoras.

In being related to cosmology and mathematics in particular, it is most assuredly a symbol of metaphysics.

The harmony of the geometric forms apparent in this symbol have influenced music, art, architecture, religion, mathmatics and yes philosophy for all of history.

Its symbolic nature can help one "to access progressively deeper levels of the unconscious, ultimately assisting the meditator to experience a mystical sense of oneness with the ultimate unity from which the cosmos in all its manifold forms arises." David Fontana: "Meditating with Mandalas", p. 10

I believe,the symbol is the complete ancient flower of life. The COMPLETE ancient flower of life is an interdimensional tool,a portal,a link back to awareness of the universal consciousness(god,the collective unconscious or whatever you would like to call it). The universal consciouness we were all part of before we entered this material world. The original fol(found in "the osireion" at abydos in egypt)is incomplete because it is only the first layer of three. The complete flower has the other two layers added,making it three dimensional. If you relax(sit three feet away from the screen)and let the flower slowly draw your eyes out of focus,the flower will open. Try and not focus on any one point,blankly stare,take the flower in as a whole. Do not strain your eyes,as it will happen naturally.(use the hand drawn flower). We do not see with our eyes,we see THROUGH our eyes. You may get a headache and itchy eyes,this will quickly disappear. This is not a known science,but if you let it happen,you will be supprised by what appears 4love and light 2all x The complete ancient flower of life is not a stereogram,a magic eye image or any other man made optical illusion.

The complete flower of life contains the tree,the fruit,the egg and the seed of life. The complete flower also contains the three dimensional metatron cube which holds all the platonic solids. Not just the building blocks of life,but the building blocks of creation itself. x http://www.sangraal.com/library/dedicated.htm

Someones taken notice. Sacred Geometry: Flower of Life - World Mysteries - Strange Artifacts Complete Flower of Life Symbol

If you get time,watch this video. I believe Nassim is speaking about the complete flower of life,without realising it. Exo575 - Nassim Haramein - The Unified Field And New Science Paradigms

Flower represented is what I know as a mind flower (as I have become to know them) which illustrates the way the mind works and how thoughts flow...basic practical evidence that reassures this claim (too me at least) is have you ever taken notice of the pattern in which one paces when one is deep in thought??? If you generally change your thought process in the middle of pacing generally your steps even direction might change, its the way I meditate and therefor I have objectively observed myself many a time.